OB2639

GENERAL DESCRIPTION

OB2639is a highly integratedcurrent modecontroller with adaptive multi-mode regulation, optimized for high performance, low EMI, low standby power consumption and wide output voltage range Quick Charger solutions, together with secondary -side controllers, such as OB2019 andOB2609 supporting HUAWEI SCP A/B and Qualcomm Quick Charge QC2.0 protocol.The controller is as well compatible with cost effective offline flyback converter applications covering a wide output range.

With On-Bright proprietary technology,OB2639 operates in QRValley lockoutoperation in high line input voltage at heavy load condition. To minimize switching loss, the maximum switching frequency in QR mode is internally limited to 100 KHz. In the low line input voltage, the IC operates in fixed frequency (85 KHz) CCM mode at the heavy loading. When the loading goes low, it operates in Green mode, the switching frequency linearly decrease from 110K to about 23K. At no load or light load condition, the IC operates in extended ‘burst mode’ to minimize switching loss.

OB2639 switching frequency is specially optimized to avoid touch panel interference issue with lower CMN (Common Mode Noise) during operation.

OB2639 offers complete protection including cycle-by-cycle current limiting (OCP), over load protection (OLP), over temperature protection (OTP), output short protection (SCP), output under voltage protection (UVP), output and VDD over voltage protection.Excellent EMI performance is achieved with On-Bright proprietary frequency shuffling technique.

The tone energy at below 23KHz is minimized to avoid audio noise during operation.

OB2639 is offered in SSOP10 package.

FEATURES

nMulti-Mode Operation

n100KHz maximum clamping frequency in 3^rdvalley switching mode @ Full Load in high line voltage

n85KHz minimum clamping frequency in CCM mode @ Heavy Load in low line voltage

nFast frequency reduction @ Green mode

nBurst Mode @ Light Load & No Load

nInternal boost VDD power supply, support wide voltage output

nExtended burst mode control for improved efficiency and low standby power

nPower on soft start reducing MOSFET Vds stress

nAdaptive frequency shuffling for EMI

nLow operating current at no/light load

nAudio noise free operation

nSwitching frequency optimized for touch panel CMN requirement

nComprehensive auto-recovery protection

oVDD under voltage lockout with hysteresis (UVLO)

oCycle-by-cycle over current protection (OCP)

oOverload protection (OLP)

oInternal Over temperature protection (OTP)

oVDD over voltage protection

oOutput over voltage protection

oOutput short protection (SCP)

oOutput diode short protection

APPLICATIONS

Offline AC/DC flyback converter for

■Quick-charging AC/DC chargers

■AC/DC Adapters with wide output range

TYPICAL APPLICATION

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